Weighing device, particulary for mounting on a vehicle

Abstract: Weighing device, particularly for mounting on a vehicle or a part thereof, such as to a weighing platform, said device comprising a bearing frame (1) connectable to the vehicle, and a weighing frame (2) provided with means for carrying a load and being suspended to the bearing frame through suspension elements (6) being movably connected to said frames. A load cell (3) is mounted in a suspension element (6) or between that and the junction to one of the frames (1, 2) and a summation device is present for summing the forces exerted on the load cells (3) during weighing. The suspension elements (6) are received in a recess (16) near the edge of the bearing frame (1) or the weighing frame (2), each individually or together, and having substantially complete freedom of movement within said recess. One end (7, 8) of a suspension element (6) is connected to a fastening member (5) connected to one of the frames (1, 2) and the other end (7) to a console (4) which extends substantially in horizontal sense to beyond the recess (16) and is connected to the other one of both said frames (2, 1).

Description: The invention relates to a weighing device, particularly for mounting on a vehicle as this is described in the preamble of the main claim. Such a device is known from EP-A-O 476 778. In case of this know device dirt and moisture from the loading surface of the weighing frame can end up in the spaces in which the suspension elements and the load cells are situated. Also mechanical damage of said parts can occur when objects end up in the spaces and on the suspension elements concerned. Especially when the loading surface of the weighing device and e.g. the loading flap in which it is mounted, are to be cleaned regularly, this can cause difficulties. The object of the invention is to remove these difficulties and to that end the features are applied as indicated in the characterizing portion of claim 1. So the housing in which a suspension element is present is fixedly connected to either the bearing frame or the weighing frame and is substantially completely closed with exception of the opening through wich a console extends which is connected to either the weighing frame or the bearing frame. By applying the feature of claim 2 it is obtained that the upper surface of the weighing frame as a whole is available for the load to be weighed, there being no consoles or other parts extending above said surface. By applying the feature of claim 3 it is obtained that the opening, which has to be present between the bearing and the weighing frame to allow movement of the weighing frame, is covered by the upper surface of the weighing frame. By providing the outer edge of the weighing frame with a flexible sheet, such as from a plastic, or with a brush a sealing can be established of the opening between the bearing frame and the weighing frame. Due to this water falling on the weighing frame can be discharged to beyond the weighing device. By a proper choice of the flexible material, this will not affect the result of the weighing, or only affect this within the acceptable tolerances. By applying the feature according to claim 5 a simple sealing can be obtained between a console and the opening in which it must be slightly movable. According to one embodiment, the bearing frame can enclose the weighing frame at least partially, with a supplementary opening for a connecting piece being present in the bearing frame, said connecting piece being mounted on the enclosed part of the weighing frame on the one hand and on the part of the weighing frame serving to carry the load on the other hand. In a special embodiment, the bearing frame can be constituted by two substantially rectangular tubes spaced apart within which parts of the weighing frame are located, that are likewise substantially rectangular and are provided with a pin-shaped fastening member engaged by the lower end of the suspension element, the upper end of which engaging the pin-shaped console connected to the bearing frame and extending through the relevant part of the weighing frame with clearance, this part of the weighing frame being provided with a connecting piece extending through the wall of the tube of the weighing frame with clearance an being connected to the part of the weighing frame serving to carry the load to be weighed. Here, the housing is an integral entirety of a part of the weighing device. Such a possibility can also be obtained when, according to a further embodiment, the bearing frame is constituted by a profile at the same time being the housing for the suspension elements located therein, and with at least a part of the weighing frame extending around said profile, said part being in the shape of a tube wherein the consoles are mounted and extend through openings in the bearing frame with clearance. The invention is further explained by way of embodiments shown in the drawing, in which: Fig. 1 through 8 show diagrammatic views of various embodiments of a device according to the invention, with certain parts being omited for the sake of clarity; Fig. 9 shows a plan view of an embodiment of a weighing device according to the invention, substantially corresponding to that of fig. 8 and being mounted on a vehicle; Fig.10 shows a vertical cross-section across a suspension element according to the line X-X of Fig. 1; Fig.11 shows a vertical cross-section according to the line XI-XI of Fig.10; Fig.12 shows diagrammatically a vertical cross-section across a part of a further embodiment; Fig.13 shows diagrammatically a plan view and partial cross-section of the device of Fig.12 on a reduced scale; Fig.14 shows diagrammatically a side view of a suspension element as it is applied with the embodiment according to the Figs. 12 and 13; Figs. 15, 16 and 17 show diagrammatically views of some further embodiments of a device according to the invention; and Fig. 18 shows a view corresponding to Fig.17, but with the device in an oblique position. In the Figures, the bearing frame is always indicated by 1, the weighing frame by 2, a load cell by 3, a console by 4, a fastening member by 5, a suspension element by 6, the ends of the suspension element 6 by 7 and 8, the cardan connection at the ends of 7 and 8 by 11, the total of the suspension by 9, the clearance being present between the bearing frame 1 and the weighing frame 2 by 12, the space in which the suspension 9 is located by 16, the housing by 17 and the opening in the housing the console 4 extends through by 18. The whole of the device is indicated by 23. The Figs. 1, 2, 3 and 4 show embodiments in which the weighing frame 2 is assembled from the parts 17 and 20, in which said parts together can constitute a plane on which a load to be weighed can be positioned. The whole of bearing frame 1 and weighing frame 2 can possibly be a loading flap 10. Here, the parts of the bearing frame can be connected to for example a tube being rotatably mounted on a vehicle. In the embodiment according to Fig. 1, the upper surface of the parts 20 of the weighing frame 2 is at equal height with the upper surface of the housings 17 and of the bearing frame 1. The bearing frame 1 can extend around the weighing frame 2, but can also consist of two parallel parts being connected by parts not further indicated of a vehicle to which the device 23 is connected. The bearing frame 1 is provided with the consoles 4 extending through openings 18 in a wall of the housing 17, in such a way that the weighing frame 2, being suspended to the consoles 4 by means of the suspension elements 6, can take up an oblique position in relation to the bearing frame 1. In the embodiment according to Fig. 2, the upper surface of the part 20 of the weighing frame 2 is located beneath the upper surface of the housings 17 and of the bearing frame 1. In the embodiment according to Fig. 3, the upper surface of the part 20 of the weighing frame 2 is in line with the upper surface of the housings 17, but at a certain height above the upper surface of the bearing frame 1, and along the edge, the weighing frame 2 is provided with a guard 13 extending across the clearance 12. The embodiment according to Fig. 4 corresponds largely to that of Fig. 3, but here, the guard 13 is additionally provided with a sheet 24 for obtaining an even better sealing of the clearance 12. Further, the sealing 14 is mounted around the console 4, said sealing connecting to the edge of the opening 18 in the wall of the housing 17. In the embodiment according to Fig. 5, the console 4 is connected to the weighing frame 2, and the fastening member 5 to the bearing frame 1. The opening 18 the console 4 extends through is now near the bottom side of the bearing frame 1. The upper surface of the weighing frame 2 is at a certain distance below the upper surface of the bearing frame 1. In the embodiment according to Fig. 6, the upper surface of the weighing frame is at a certain height above the upper surface of the bearing frame 1 and again a guard 13 and a sealing 14 are provided. In the embodiment according to Fig. 7, the bearing frame 1 is constituted by rectangular tubes being at the same time the housings 17. The consoles 4 are fixedly mounted in the tubes and each console extends through two openings 18 in a part of the suspension 9, said part being substantially an entity with the weighing frame 2. The cardan connection 11 is mounted between two openings 18, as a result of which the end 7 of the suspension element 6 is supported. The other end 8 of the suspension element 6 also carries a cardan connection 11 connected to the fastening member 5 being part of the weighing frame 2. Further, a lateral connecting piece 21 is provided, extending through a secondary opening 22 in the bearing frame 1 and being connected to the further part 20 of the weighing frame 2. The opening 22 can be sealed by the flexible sealing 14. Further, the loading surface of the weighing frame 2 is indicated by 15. In the embodiment according to Fig. 8, the weighing frame 2 is constituted by rectangular tubes being at the same time the housing 17. Within each tube, there is a part of the bearing frame 1 which will be connected to a part of the vehicle in a way not further indicated. For example, the bearing frame 1 can comprise two parallel legs across which the weighing frame 2 is slid. The tubes of the weighing frame can then be sealed at one end. The console 4 is fixedly connected to the weighing frame 2 and extends again through openings 18 in the suspension 9, with the end 8 of a suspension element 6 being present between said openings 18. Fig. 9 shows an embodiment largely corresponding to that of Fig. 8. Here, the bearing frame 1 is constituted by two tubes connected to a part of a vehicle 25 and extending in the two tubes which in turn constitute the weighing frame 2. The two tubes are now connected by a beam 26 so that a U-shaped weighing frame 2 is obtained. For example, such a weighing device can be part of a fork-lift truck, or can be provided with engaging members - not shown - for taking up a load such as a container. Basically, a weighing device 23 can also be constructed in such a way, that the weighing frame 2 only consists of one single tube as it is shown in Figs. 8 and 9 and which tube thus is supported by the bearing frame e.g. also comprising one single tube, through two suspension elements 6. Such an embodiment can be applied when a load to be weighed is suspended from the weighing frame 2. With such a load, the weighing frame will only perform a limited angular rotation in relation to the bearing frame. Figs. 10 and 11 show in more detail a possible embodiment of the suspension of a part of a weighing frame 2 to a part of a bearing frame 1 being within the bearing frame. Such a suspension can be applied with the embodiments according to the Figs. 8 and 9, for example. The console 4 and the fastening member 5 are designed as shafts provided with convex members that concave members bear upon, so that cardan connections 11 are obtained at the ends 7 and 8 of the suspension element 6. At the same time, the load cell 3 is received in the suspension element 6, as it appears from Fig. 11 in particular. The Figs. 12 and 13 show a special embodiment of a device 23 according to the invention in which the weighing frame 1 is constituted by at least two profiles connected to each other by a plate-shaped part for obtaining the loading surface 15. The bearing frame 1 again consists of two tubes and the consoles 4 are connected thereto. Each console 4 extends through an opening 18 in a wall of the housing 17 constituted by one of the profiles a fastening member 5 is connected to. The console 4 and the fastening member 5 have a cilindrical cross-section and at the position where they are connected to the suspension elements they are provided with a convex part cooperating with a corresponding concave part of a suspension element 6. Again, the opening 18 is sealed by means of a sealing 14. The load cell 3 is located in the suspension element 6 as it is shown in Fig. 14. Fig. 15 shows diagrammatically how a load cell 3 can be incorporated in a fastening member 5. The fastening member 5 is connected to the bearing frame 1 and is connected to the end 8 of a suspension element 6 near the other end, the other end 7 of which being connected to a console 4, which in turn is connected to the weighing frame 2 and extends through an opening 18 in the housing 17. The embodiment according to Fig. 16 corresponds largely to that of Fig. 15. Here, however, the fastening member 5, in which the load cell 3 is incorporated, is connected to the weighing frame 2, and the console extending through the wall of the housing 17 is connected to the bearing frame 1. The Figs. 17 and 18 show an embodiment of a weighing device 23 corresponding largely to the embodiment according to fig. 1. Here, however, the housing 17 is partly provided with a non-closed wall so that the parts of the suspension 9 are substantially only protected against mechanical damage. Fig. 18 illustrates the position of the device when it is used on a vehicle so that the upper surface of the device can not be brought into a horizontal plane. However, this causes no difficulties, since nevertheless accurate weighing can be effected. It will be obvious, that only some possible embodiments of a device according to the invention are illustrated in the drawing and described above, and that many modifications can be made without leaving the inventive idea.

Claims: A weighing device for mounting on a vehicle or a part connected thereto comprising a bearing frame (1) connectable to the vehicle or to said part thereof, and a weighing frame (2) for carrying a load and suspended to the bearing frame through suspension elements (6) which are both flexible and movably connected to respective connection members (4,5) extending laterally and being connected to said weighing and bearing frames respectively (1, 2) to allow the weighing frame (2) to move freely in relation to the bearing frame (1) within certain limits, a load cell (3) being mounted in a suspension element (6), and a summation device summing the forces exerted on the individual load cells (3), said suspension elements (6) each being arranged near the bearing and weighing frame edges, each of said suspension elements (6) is positioned enclosing said suspension element, within a housing (17) characterized in that said housing is fixedly connected to one of said frames (1,2), said suspension element (6) being flexibly connected to a connection member (4,5) which is fixedly connected to said housing (17) such that said supension element is having substantially its complete freedom of movement with in said housing, the connection member (5,4) connecting said suspension element to the other frame (2,1) extending through an opening (18) in said housing. Weighing device according to claim 1, characterized in that said housing (17) is situated completely below the upper surface of the weighing frame (2). Weighing device according to claim 1 or 2, characterized in that the edges of the upper surface of the weighing frame (2) are situated at a higher level than the upper surface of the bearing frame (1), said upper surface of the weighing frame extending laterally above part of said bearing frame (1). Weighing device according to claim 3, characterized in that the outer edge of the weighing frame (2) is provided with a flexible sheet (24), such as from a plastic, or with a brush, establishing a sealing of the opening (12) between the bearing frame (1) and the weighing frame (2). Weighing device according to one of the preceding claims, characterized in that said connecting member (4,5) extending through said opening (18) in said housing (17) has a cylindrical shape at least there where it passes through said opening. Weighing device according to one of the preceding claims, characterized in that the opening (18) in the housing (17) through which said connecting member (4,5) extends, is provided with a flexible sealing (14) extending around the member, of a material such as plastic, rubber. Weighing device according to one of the preceding claims, characterized in that the bearing frame (1) encloses the weighing frame (2) at least partially and that the bearing frame (1) comprises a secondary opening (22) for a connecting piece (21) being mounted to the enclosed part of the weighing frame (2) on the one hand and to the part of the weighing frame that serves for carrying the load on the other hand. Weighing device according to claim 7, characterized in that the bearing frame (1) comprises two spaced apart, substantially rectangular tubes, in which there are parts of the weighing frame (2) that are likewise substantially rectangular and which are provided with a pin-shaped fastening member (5) being engaged by the lower end of the suspension element (6), the upper end of which engages a pin-shaped console (4) connected to the bearing frame (1) and extending through the relevant part of the weighing frame (2) with clearance, this part of the weighing frame being provided with a connecting piece (21) extending through the wall of the tube of the weighing frame (2) with clearance and being connected to the part of the weighing frame (2) which serves for carrying the load to be weighed. Weighing device according to one of the claims 1 - 6, characterized in that the bearing frame (1) is a profile which at the same time is the housing for the suspension elements (6) located therein and with at least a part of the weighing frame (2) extending around said profile, said part being substantially in the shape of a tube within which the connecting members (4) are mounted, extending with clearance through openings (18) provided in the bearing frame (1).

Inventors: NUYTS HENRY, NUYTS, HENRY
Applicants: NUYTS ORB NV, NV NUYTS ORB
Application year: 1994
Main classification: G01G19
IPC codes: G01G19